Norfolk Island is a small island in the Pacific Ocean, and the language spoken there is Norfuk, which is a unique creole language based on 18th-century English. While it has borrowed some words from other languages, it doesn't have a distinct greeting like "hello".
The most common way to greet someone in Norfuk is simply by using the English word "hello". You might also use "Good morning", "Good afternoon", or "Good evening", depending on the time of day.